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Light

From Vikidia, the encyclopedia for 8 to 13-year-old children that everybody can make better
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Light is a form of energy that is visible to the human eye. It travels at a constant speed, represented by the letter c. The distance that light travels in a year is called a light year.

The color of light is determined by its frequency, or wavelength. White light is a combination of multiple colors.

Light can also be thought to exist as discrete particles, called photons. These are too small to observe directly.